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The stability of the current Internet architecture depends mostly on end-to-end TCP congestion control mechanisms. The Network Congestion Analyzer and Controller (NCAC) is an effort to build a complete user interface application to NS-2 that provides graphical access to most of NS2's functionalities. Besides, the application provides powerful visual tools for monitoring and displaying network performance metrics calculated by the simulation. The application is developed in Java to benefit from Java's portability and platform independence. There are three main parts in NCAC: (1) NS-2 interface, (2) network animation and alarm, and (3) graph plotting application. The functionality of each part is discussed.